Charging output of USB-C ports: We measured USB-C output by connecting a half-charged power bank to a Total Phase USB Power Delivery Analyzer, an Apple USB-C cable, and a MacBook Pro.We then turned up the amperage of the load tester as far as it could go without overloading the power bank and recorded the volts and amps we measured with the PortaPow to calculate the maximum output (watts). Charging output of USB-A ports: We measured USB-A output by connecting a half-charged power bank to a PortaPow and a Drok USB load tester.We considered how easy and intuitive its features-such as the power buttons, charging-status lights, built-in cables, fold-out AC plug, or flashlight-were to use. Look and feel: We took note of each power bank’s bulk and exterior texture.Size: Rather than measure the length, width, and depth of each power bank-which would have been tedious, and not terribly meaningful for most people-we considered size in terms of whether a power bank fit inside a wallet, a pocket (we tried a variety of pants, skirt, and jacket pockets), or an accessories pouch. ![]()
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